Bouncing this up for you.
Are you looking to fly direct, or would you be open to changing planes somewhere? If you're willing to change planes, pretty much any major airline would be an option.
If you want direct, I believe Delta flies from Newark to Orlando as Song. United or American might fly direct EWR - MCO, but I'm not certain.
Also, are you going to be in the NYC area for any period of time before going on to Orlando, or are you going directly to Orlando after arriving at EWR? If you're going direct, it would probably be more convenient for you to take Continental the whole way. At the very least, you wouldn't have to worry about getting and rechecking your luggage.